Use buttons for forward progress

This kind of UI mistake assumes that screens (as well as fingers) are the same size. For some users, clicking a text link can be difficult on a small screen. It’s a much smaller target to hit than a button:

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Conclusion

Optimization of the mobile checkout process covers a number of elements, but they all orbit around a central concept.

Get your customer to the end of the checkout as easy as possible with the minimum number of clicks.

To reduce cart abandonment and improve conversions, you need to make that process as easy as possible. It should happen in just a few clicks (because the shopping experience is done and they’re ready to go), with minimal opportunities for the customer to walk away.